page_title: Pseudopupil
hierarchical_section_title: Pseudopupil
caption_attribution_description: Close up of Pseudosquilla ciliata eye
context_page_description: In the compound eye of invertebrates such as insects and crustaceans, the pseudopupil appears as a dark spot which moves across the eye as the animal is rotated. This occurs because the ommatidia that one observes "head-on" absorb the incident light, while those to one side reflect it. The pseudopupil therefore reveals which ommatidia are aligned with the axis along which the observer is viewing.
context_section_description: In the compound eye of invertebrates such as insects and crustaceans, the  pseudopupil appears as a dark spot which moves across the eye as the animal is rotated. This occurs because the ommatidia that one observes "head-on" (along their optical axes) absorb the incident light, while those to one side reflect it. The pseudopupil therefore reveals which ommatidia are aligned with the axis along which the observer is viewing.
caption: The eye of a mantis shrimp has three regions, each with its own pseudopupil.
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